Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D9/0087—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall with flexible plates
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
  • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

• the present invention refers to a heat exchanger for
• essentially counterflow heat exchange between two air flows comprising inside a housing a number o f essentially parallel partitions of flexible membranes forming first channels for a first, warmed air flow and alternating second channels for a second, cooled air flow, further a first inlet and first outlet in said housing for said first air flow and a second inlet and outlet for said second air flow.
• a prime use for the invention is heat recovery in domestic and industrial buildigs ventilation system and specifically for heat recovery from very polluted and corrosive exhaust air.
• a first purpose with the invention, using thin plastic membranes as heat exchanger surface, is to achieve with simple means full control over flew channel geometry, simplified joining of the separate channel systems to inlets and outlets for the separate air flows and simplified
• a second purpose is to provide flow channels for a polluted, moist and corrosive exhaust all flow, cooled in the apparatus, that are smooth, unobstructed by spacing elements, that have a high corrosive resistance and that are exceptionally easy to clean.
• a third purpose is to combine reasonable, small flow resistance for the air with a well extended channel length needed for high heat exchange efficiency.
• a forth purpose is a heat exchanger, that acts as an exceptionally good absorber of fan noise.
• pairs of said membranes enclosing essentially gas tight said first channels further comprises the ends of said membranes enclosing and laminated to air penetrable tension plates, preferably of corrugated cardboard, further comprises a strapping device for strapping said tension platesto said housing each with double said tension force, further comprises said tension plates connected to said first inlet and first outlet and further comprises within said first channels as spacing elements strips of corrugated material, preferably corrugated cardboard, that are positioned essentially at right angle to air flow, are
• Elastic sheets as partitions in a gas heat exchanger are known from SU,A, 1200114. This document shows
• Figure 1 shows a plan section and figure 2 a longitudinal cross section.
• Figures 1a and 2a show in plan and cross section an
• figure 3 a package of tension plates, figure 4 flow channels and figure 5 flow channels being cleaned.
• Figure 6 shows a detailed plan section of flow channels and figure 7 illustrates an example of pressure loss, pressure load on membranes and spacing of supporting strips in a flow channel.
• FIGS. 1-4 are within a housing 9 arranged a number of essentially parallel partitions 3, forming first channels 4 for a first, warmed air flow 1 and alternating second channels 5 for a counterflow driven second, cooled air flow 2.
• the parti tions are well extended and comprise in the air flow direction stretched plastic film membranes 3' and 3" of
• Each membrane is stretched with a substansial tension force P and the pair of membranes 3', 3" enclose essentially gas tight the first channels 4.
• the membranes 3', 3" are at their ends pairwise laminated to and enclosing a gas penetrable tension plate 6 preferably of corrugated cardboard.
• a gas penetrable tension plate 6 preferably of corrugated cardboard.
• adjacent tension plates are packed to each other and against the housing 9, using suitable intermediate sealing 61.
• the tension plates 6 are connected to a first inlet 11 and a first outlet 12 for the first, warmed air flow 1. They are further by a strapping device 7, secured to the housing 9, each affected by a tension force 2P.
• the second channels 5 are open in the housing 9 to a second inlet 21 and second outlet 22 for the second air flow 2.
• the first channels 4 comprise as spacing elements gas penetrable strips 8 of corrugated material, positioned at intervalls "a" along the channels at essentially right angles to flow direction.
• the strips alternate with deflated segments 31 of the membranes 3', 3", formed by local positive pressure differances A p between the second 5 and first channels 4.
• a positive value for ⁇ p is ensured at all points by the coupling of the first outlet 12 to the suction side of a fan for propelling first air flow 1 and the coupling of the second inlet 21 to the pressure side of a fan for the second air flow 2.
• the second channels lack spacing elements and has a smooth, unobstructed surface with high corrosive
• the strips 8 may therefore like the
• tension plates 6 be cut out of corrugated cardboard and be laminated to one of the membranes 3' or 3".
• polyester film type "Melinex" from ICI, in a standard thickness of 75 or 125 for tough conditions.
• This film is utterly stable in dimension, has high tensile strength and high chemical stability to moisture and corrosive gases. In said thickness heat resistance in the film is negligable.
• an element "A” or "B” is formed, which in the apparatus may be added to any desired flow capacity.
• the elements may to a small marginal cost be extended in length for increased heat exchange efficiency. Longitudinal open edges of the sheet join by suction in the elements but may further be sealed by a glue bond.
• the pressure difference ⁇ p between second and first channels will increase from first inlet 11 to first outlet 12.
• a strapping device 7 may according to figures 1 and 2 comprise straps 71 anchored to the tension plates 6 and further anchored to the housing directly at one end and indirectly at the other end via an adjustable spring device 72.
• This spring device may comprise a rectangular plate 721, to which four or eight straps 71 are anchored at the corners. The centre of the plate is pulled by a spring 722. In this manner four or eight tension plates 6 may equally tensioned by one adjustable spring 722.
• An alternate spring device may according to figures 2a and 1a comprise a rubber bag 73, reacting on all said plates 721 and a box 74, anchored to the housing 9.
• a mainly horizontal gas flow direction is
• the apparatus has proven to be an exceptionally good sound absorber.
• the different, strung segments 31 with separate lengths self oscillate at separate tones and will thus constitute an efficient wide-spectrum noise absorber.
• first outlet12 and second inlet 21 via air fans to the interior, fan noise to the outside, very often a severe nuisance, is practically totally eliminated.
• the invention using simple means such as corrugated cardboard and thin polyester film, constitutes a useful, versatile tool for heat recovery between air, including very polluted and corrosive exhaust air.
• the invention solves by simple means the

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (3)

Cited By (7)

Families Citing this family (1)

Citations (7)

• 1989
  • 1989-09-15 SE SE8903046A patent/SE465894B/sv not_active IP Right Cessation
• 1990
  • 1990-09-14 WO PCT/SE1990/000584 patent/WO1991004451A1/en not_active Application Discontinuation
  • 1990-09-14 EP EP19900914254 patent/EP0509999A1/en not_active Withdrawn

Patent Citations (7)

Non-Patent Citations (1)

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